sound of two magnets colliding with each other is clear and pleasant to listen to, so we all have fun playing.

When we grow up, our life is inseparable from it, the maglev train to travel, the MRI of the hospital, the loudspeaker used at home, the electromagnetic gun developed by all countries in the military...

The magnet actually has so many magical functions, today with you to understand its development and production process.

The development of magnets:

Natural magnetite was discovered 5,000 years ago.

About 2,300 years ago, the Chinese ground natural magnets into the shape of a spoon and put them on the smooth ground. Under the action of geomagnetic, the spoon handle guide became the world's first guide instrument.

About 1,000 years ago, the Chinese made the world's first compass by rubbing and magnetizing an iron rod with a magnetic rod.

Later, the Chinese used magnetite needles and azimuth discs to make magnetite guides for navigation.

In 1820 Danish physicists discovered that electric currents cause magnetism.

New magnets with a mixture of nickel, aluminum and cobalt were discovered in Japan in the 1930s.

In the 1970s, Japanese scientists invented neodymium magnets, dubbed the "King of permanent magnets."

The manufacturing process of Ndfeb permanent magnet:

Batching → Melting (1-2 days) → Milling (12h) → Shaping orientation (2-3 days) → Sintering (1 day) → Magnetic detection → Machining (3-5 days) → Pin cutting → Electroplating (2-3 days) → Magnetization → Finished product

One of the most time-consuming is the initial batching to sintering process, this process can be said to be the production of Ndfeb blank.

In the ordinary production, if there is no such raw material will need to wait for material production, if there is ready-made raw material then the production cycle can be greatly shortened!